My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on. Submitted by Iain_MS t3_z84a06 on November 29, 2022 at 7:58 PM in mildlyinteresting 91 comments 197
kneecapped33 t1_iybv4xp wrote on November 30, 2022 at 6:03 AM Mercury is viscus enough of a liquid to not bounce back and forth on the relay Permalink 2
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